M94 as a Unique Testbed for Black Hole Mass Estimates and AGN Activity at Low Luminosities

Table 2

Emission line measurements^a.

line name	𝐻𝑆𝑇-STIS	Palomar^b	Bok^c	MMTO^d
[O I] 𝜆6300	5.03±0.31	6.03	2.8±0.9	7.0±1.0
H𝛼 (narrow)	3.00±0.32	> 25.12	13.5±1.9	22.0±2.4
[N II] 𝜆6583	5.25±0.25	54.01	21.5±1.5	39.3±2.9
[S II] 𝜆6716	2.48±0.18	18.59	8.3±1.1	15.5±0.3
[S II] 𝜆6731	2.16±0.18	16.33	7.2±1.1	9.8±0.3

aAll fluxes are in units of 10⁻¹⁵ergs⁻¹cm⁻² and represent the observed values, not corrected for reddening.
bnonphotometric conditions; line ratios are at least 50% uncertain.
^c2.^′′5 slit, 2.3 m telescope; photometric conditions [45].
^d1^′′slit; fluxes are in units of 10⁻¹⁵ergs⁻¹cm⁻².